Seawater osmosis filtration method and osmosis water intake unit

Abstract

The present invention provides a seawater infiltration filtration method and a infiltration water intake unit, which cleans the surface layer of the sand filter layer and the suspended matter introduced into the middle layer. The seawater infiltration filtration method of the invention pre-forms the infiltration water intake unit (11) , the infiltration water intake unit is buried in the water intake pipe (12) in the deep gravel layer (13) used to form the sand filter layer, and is buried in the backwash layer (15) in the middle layer and surface layer used to form the sand filter layer. Pipe (14), a water suction pipe (16) is provided above the sand layer (15). A required number of infiltration water intake units (11) are combined at a location on the seabed to form a sand filter layer, and seawater that naturally penetrates from the sea along the sand filter layer is introduced into the water intake pipe (12) to draw seawater. The seawater penetration rate is set to 400m / day or less. Spray water or air from the backwash pipe (14) to stir the suspended matter introduced into the middle layer of the sand filter layer, causing it to roll up on the upper surface of the sand filter layer, and suck the stirring water from the water suction pipe (16) for recovery . The present invention can maintain the seawater penetration speed as high as possible, which is less than or equal to 400m / day.

Description

technical field [0001] The present invention relates to a filtration method and an infiltration water intake unit. The filtration method is a filtration method for water intake of seawater permeated from the sand layer on the sea bottom. The infiltration water intake unit is used for implementing the filtration method and has the function of backwashing. Pipe, etc., the backwashing pipe removes the organisms or suspended substances accumulated on the surface of the sand layer and introduced into the middle layer to prevent the clogging of the screen mesh. Background technique [0002] As a method of taking water from seawater, most of the methods such as Figure 14 As shown, for example, a direct water intake method is used to draw water from seawater from a water intake 1 arranged on the seabed through an aqueduct 2 . also, Figure 14 3 is a pump for taking water from seawater, and 4 is a reverse osmosis membrane device. [0003] However, in the direct water intake method,...

AI Technical Summary

Problems solved by technology

This indirect water intake method does not have the problems of the direct water intake method at all, but due to the high initial cost and the problem of reduced water intake due to the clogging of the mesh on the permeable surface, the spread of the method is slow.

[0008] However, in the osmotic water intake method proposed in the above-mentioned Patent Document 1, the seawater infiltration water intake rate is 1 to 8 m / day, which is a very slow filtration rate. Therefore, in order to extract a large amount of seawater in a short time, a large area is required. Larger project scale (technical problem 1)

Therefore, it is possible to reduce the seawater infiltration rate by only removing the suspended matter accumulated on the surface of the sand filter layer.

[0014] In addition, for example, in the infiltration water intake method of Patent Document 1, a support gravel layer 5a is formed at the excavation part of the seabed, and the water intake pipe 6 is buried, and a support gravel layer 5b and filter sand 5c are formed on the top of the support gravel layer 5a. At the same time, Backfilling to the seabed surface again, the above-mentioned works are all carried out on the seabed site, so the scale of the installation project is large

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